MCPInstall

better-auth-best-practices

Configure Better Auth server and client, set up database adapters, manage sessions, add plugins, and handle environment variables. Use when users mention Better Auth, betterauth, auth.ts, or need to set up TypeScript authentication with email/password, OAuth, or plugin configuration.

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Install

Works with every agent the skills CLI supports.

npx skills add https://github.com/connorads/dotfiles --skill better-auth-best-practices
  1. 01

    Install

    Run the command in your project. The CLI asks which agents to install for.

  2. 02

    Describe the task

    Ask your agent for something this skill covers. It loads better-auth-best-practices automatically when relevant.

  3. 03

    Review the result

    The agent follows the SKILL.md steps, scripts and references bundled with the skill.

SKILL.md

The instructions your agent reads when the skill is triggered.

Better Auth Integration Guide

Always consult better-auth.com/docs for code examples and latest API.


Setup Workflow

  1. Install: npm install better-auth
  2. Set env vars: BETTER_AUTH_SECRET and BETTER_AUTH_URL
  3. Create auth.ts with database + config
  4. Create route handler for your framework
  5. Run npx @better-auth/cli@latest migrate
  6. Verify: call GET /api/auth/ok — should return { status: "ok" }

Quick Reference

Environment Variables

  • BETTER_AUTH_SECRET - Encryption secret (min 32 chars). Generate: openssl rand -base64 32
  • BETTER_AUTH_URL - Base URL (e.g., https://example.com)

Only define baseURL/secret in config if env vars are NOT set.

File Location

CLI looks for auth.ts in: ./, ./lib, ./utils, or under ./src. Use --config for custom path.

CLI Commands

  • npx @better-auth/cli@latest migrate - Apply schema (built-in adapter)
  • npx @better-auth/cli@latest generate - Generate schema for Prisma/Drizzle
  • npx @better-auth/cli mcp --cursor - Add MCP to AI tools

Re-run after adding/changing plugins.


Core Config Options

OptionNotes
appNameOptional display name
baseURLOnly if BETTER_AUTH_URL not set
basePathDefault /api/auth. Set / for root.
secretOnly if BETTER_AUTH_SECRET not set
databaseRequired for most features. See adapters docs.
secondaryStorageRedis/KV for sessions & rate limits
emailAndPassword{ enabled: true } to activate
socialProviders{ google: { clientId, clientSecret }, ... }
pluginsArray of plugins
trustedOriginsCSRF whitelist

Database

Direct connections: Pass pg.Pool, mysql2 pool, better-sqlite3, or bun:sqlite instance.

ORM adapters: Import from better-auth/adapters/drizzle, better-auth/adapters/prisma, better-auth/adapters/mongodb.

Critical: Better Auth uses adapter model names, NOT underlying table names. If Prisma model is User mapping to table users, use modelName: "user" (Prisma reference), not "users".


Session Management

Storage priority:

  1. If secondaryStorage defined → sessions go there (not DB)
  2. Set session.storeSessionInDatabase: true to also persist to DB
  3. No database + cookieCache → fully stateless mode

Cookie cache strategies:

  • compact (default) - Base64url + HMAC. Smallest.
  • jwt - Standard JWT. Readable but signed.
  • jwe - Encrypted. Maximum security.

Key options: session.expiresIn (default 7 days), session.updateAge (refresh interval), session.cookieCache.maxAge, session.cookieCache.version (change to invalidate all sessions).


User & Account Config

User: user.modelName, user.fields (column mapping), user.additionalFields, user.changeEmail.enabled (disabled by default), user.deleteUser.enabled (disabled by default).

Account: account.modelName, account.accountLinking.enabled, account.storeAccountCookie (for stateless OAuth).

Required for registration: email and name fields.


Email Flows

  • emailVerification.sendVerificationEmail - Must be defined for verification to work
  • emailVerification.sendOnSignUp / sendOnSignIn - Auto-send triggers
  • emailAndPassword.sendResetPassword - Password reset email handler

Security

In advanced:

  • useSecureCookies - Force HTTPS cookies
  • disableCSRFCheck - ⚠️ Security risk
  • disableOriginCheck - ⚠️ Security risk
  • crossSubDomainCookies.enabled - Share cookies across subdomains
  • ipAddress.ipAddressHeaders - Custom IP headers for proxies
  • database.generateId - Custom ID generation or "serial"/"uuid"/false

Rate limiting: rateLimit.enabled, rateLimit.window, rateLimit.max, rateLimit.storage ("memory" | "database" | "secondary-storage").


Hooks

Endpoint hooks: hooks.before / hooks.after - Array of { matcher, handler }. Use createAuthMiddleware. Access ctx.path, ctx.context.returned (after), ctx.context.session.

Database hooks: databaseHooks.user.create.before/after, same for session, account. Useful for adding default values or post-creation actions.

Hook context (ctx.context): session, secret, authCookies, password.hash()/verify(), adapter, internalAdapter, generateId(), tables, baseURL.


Plugins

Import from dedicated paths for tree-shaking:

import { twoFactor } from "better-auth/plugins/two-factor"

NOT from "better-auth/plugins".

Popular plugins: twoFactor, organization, passkey, magicLink, emailOtp, username, phoneNumber, admin, apiKey, bearer, jwt, multiSession, sso, oauthProvider, oidcProvider, openAPI, genericOAuth.

Client plugins go in createAuthClient({ plugins: [...] }).


Client

Import from: better-auth/client (vanilla), better-auth/react, better-auth/vue, better-auth/svelte, better-auth/solid.

Key methods: signUp.email(), signIn.email(), signIn.social(), signOut(), useSession(), getSession(), revokeSession(), revokeSessions().


Type Safety

Infer types: typeof auth.$Infer.Session, typeof auth.$Infer.Session.user.

For separate client/server projects: createAuthClient<typeof auth>().


Common Gotchas

  1. Model vs table name - Config uses ORM model name, not DB table name
  2. Plugin schema - Re-run CLI after adding plugins
  3. Secondary storage - Sessions go there by default, not DB
  4. Cookie cache - Custom session fields NOT cached, always re-fetched
  5. Stateless mode - No DB = session in cookie only, logout on cache expiry
  6. Change email flow - Sends to current email first, then new email

Resources

FAQ

What does the better-auth-best-practices skill do?

Configure Better Auth server and client, set up database adapters, manage sessions, add plugins, and handle environment variables. Use when users mention Better Auth, betterauth, auth.ts, or need to set up TypeScript authentication with email/password, OAuth, or plugin configuration.

How do I install better-auth-best-practices?

Run npx skills add https://github.com/connorads/dotfiles --skill better-auth-best-practices in your project. The skills CLI detects the agents you use and copies the skill into the right folder. For Claude Code you can also place the skill folder at ~/.claude/skills/better-auth-best-practices/ (personal) or .claude/skills/better-auth-best-practices/ (project).

Which AI agents can use better-auth-best-practices?

Any agent that supports the open Agent Skills format (a folder with a SKILL.md file), including Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, Windsurf, Cline, OpenCode and more.

Is better-auth-best-practices safe to install?

No partner security audit is available yet. Skills can run commands and scripts, so read the SKILL.md and any bundled files before installing.

Who maintains better-auth-best-practices?

It is published by connorads in connorads/dotfiles. It has 65 recorded installs.

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